Can you make a portal that uses energy for work / activation? For example, one of the blocks of which will be a rechargeable battery (from any technological modification) and when using such a portal will consume some amount of energy from this battery (amount is configurable).

Sure, I'll put this on my to-do list.

As a temporary workaround, I believe you can change the activation item. Instead of flint and steel, you could use an item that requires RF to generate. A fully charged battery is the obvious but not very creative option.